Hello everyone,
I have a nrf52832 (SDK v15.2.0) that is connected to a tablet via BLE. However, if I have several SPI transfers one after another, the BLE suddenly disconnects. It doesn't make a difference neither if I use the DMA or if I'm blocking. The priority of the SPI interrupts is also very low and equal to 6. I need to mention that all the SPI transfers are done in the function I schedule once (which is called do_all_the_xfers() here). So it looks the following:
static void do_all_the_xfers(void * data, uint16_t len) {
for(uint32_t i = 0; i < 4294967295; i++) {
status = pltf_spim_xfer2();
if(status != NO_ERROR) return;
}
}
While pltf_spim_xfer2() looks like this:
static const nrfx_spi_t spi = NRFX_SPI_INSTANCE(FLASH_SPI_INSTANCE);
bool spi_xfer_done = false;
void spi_event_handler(nrfx_spi_evt_t const * p_event,
void * p_context) {
spi_xfer_done = true;
}
status_t pltf_spim_xfer2(void) {
uint32_t err_code, flags;
flags = 0;
spi_xfer_done = false;
nrfx_spi_xfer_desc_t xfer;
char read_id_cmd = 0x9F;
char rx_buf[3];
xfer.p_tx_buffer = &read_id_cmd;
xfer.tx_length = 1;
xfer.p_rx_buffer = NULL;
xfer.rx_length = 0;
nrf_gpio_pin_clear(FLASH_SPI_SS_PIN);
err_code = nrfx_spi_xfer(&spi, &xfer, flags);
if(err_code != 0) { NRF_LOG_INFO("err_code: %i", err_code); NRF_LOG_FLUSH(); }
while(!spi_xfer_done){};
spi_xfer_done = false;
xfer.p_tx_buffer = NULL;
xfer.tx_length = 0;
xfer.p_rx_buffer = rx_buf;
xfer.rx_length = 3;
nrf_gpio_pin_clear(FLASH_SPI_SS_PIN);
err_code = nrfx_spi_xfer(&spi, &xfer, flags);
if(err_code != 0) { NRF_LOG_INFO("err_code: %i", err_code); NRF_LOG_FLUSH(); }
while(!spi_xfer_done){};
return NO_ERROR;
}
Therefore, the scheduler doesn't go back to the main loop until its done with all the transfers. Nevertheless, according to my understanding the Bluetooth has such a high priority that even in case of a while(1) loop, its interrupts are handled. So what could be the problem?
Thanks in advance!
